Police search for missing Perth man in Kimberley

Joshua Karlsen left behind his wallet and personal items at the Lodge.

Supplied: WA Police

Police and SES volunteers are scouring the central Kimberley for a Perth man missing since Saturday night.

Joshua Karlsen, 20, was last seen about 8:30 pm on Saturday at the Fitzroy River Lodge, about 400 kilometres east of Broome.

He had been working with his father in the area.

While police say there is no sign of foul play, they are concerned for Mr Karlsen's welfare because he left without his wallet and is not answering his mobile phone.

Senior Sergeant Trevor Evans says a large search team has been mobilised.

"Obviously with the heat and possibly a lack of water, we have concerns he may be suffering some dehydration, so we do want to locate him to ensure he's ok," he said.

Sergeant Evans says while there is no sign of foul play, police are concerned for Mr Karlsen's welfare and would like to locate him as soon as possible.

"What we're really seeking are any members of the community who may have picked someone up around Fitzroy Crossing, either travelling to Broome or Kununurra, who was hitch-hiking along the way," he said.